Radiation damage effects on CMS-sensors quality assurance and irradiation tests

The LHC at CERN (Geneva, Switzerland) is a proton-proton collider with a luminosity of 10³⁴ (1/cm²s) be working for 10 years (starting in 2007). CMS will be one of the general purpose detectors. The CMS tracker consists of 10 barrel layers, plus 2 times 9 endcap disks, all together 24328 silicon sensors with a total area of 206m² silicon, covering a pseudorapidity of η ≤ 2.5. For the sensors close to the beam pipe fluences of 1.6 10¹⁴ (n1MeV/cm²) are expected over the 10 years lifetime. To guarantee the functionality of the single side silicon sensors during the runtime of LHC a quality assurance was developed. In the 2 Irradiation Qualification Centers (IQC) in Karlsruhe (Germany) and Louvain-la-Neuve (Belgium) a fraction of 1% of the sensors are electrically qualified. In Karlsruhe the sensors are irradiated with 26 MeV - protons and in Louvain-la-Neuve with fast neutrons. For safety reasons sensors are irradiated with a fluence 50% higher than predicted. The electrical parameters are determined before and after irradiation.